/* JAI-Ext - OpenSource Java Advanced Image Extensions Library
*    http://www.geo-solutions.it/
*    Copyright 2014 GeoSolutions


* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at

* http://www.apache.org/licenses/LICENSE-2.0

* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.eclipse.imagen.media.algebra.constant;

import java.awt.RenderingHints;
import java.awt.image.RenderedImage;
import java.awt.image.renderable.ParameterBlock;
import java.awt.image.renderable.RenderedImageFactory;
import org.eclipse.imagen.CRIFImpl;
import org.eclipse.imagen.ImageLayout;
import org.eclipse.imagen.ROI;
import org.eclipse.imagen.media.algebra.AlgebraDescriptor.Operator;
import org.eclipse.imagen.media.opimage.RIFUtil;
import org.eclipse.imagen.media.range.Range;

/**
 * {@link RenderedImageFactory} implementation for the OperationConst operation
 *
 * @author Nicola Lagomarsini geosolutions
 */
public class OperationConstCRIF extends CRIFImpl {

    /** Constructor. */
    public OperationConstCRIF() {
        super("operationConst");
    }

    /**
     * Creates a new instance of <code>OperationConstOpImage</code> in the rendered layer. This method satisfies the
     * implementation of RIF.
     *
     * @param paramBlock The two source images to be added.
     * @param renderHints Optionally contains destination image layout.
     */
    public RenderedImage create(ParameterBlock pb, RenderingHints renderHints) {
        // Get ImageLayout from renderHints if any.
        ImageLayout layout = RIFUtil.getImageLayoutHint(renderHints);
        // Getting the source
        RenderedImage source = pb.getRenderedSource(0);
        // Getting the parameters
        Operator op = (Operator) pb.getObjectParameter(1);
        // Check for the constants
        double[] constants = null;
        Object param = pb.getObjectParameter(0);
        if (param != null) {
            if (param instanceof double[]) {
                constants = (double[]) param;
            } else if (param instanceof int[]) {
                int[] paramInt = (int[]) param;
                constants = new double[paramInt.length];
                for (int i = 0; i < paramInt.length; i++) {
                    constants[i] = paramInt[i];
                }
            }
        }

        ROI roi = (ROI) pb.getObjectParameter(2);
        Range noData = (Range) pb.getObjectParameter(3);
        double destinationNoData = 0;
        int numParams = pb.getNumParameters();
        if (numParams > 4) {
            destinationNoData = pb.getDoubleParameter(4);
        }

        return new OperationConstOpImage(source, renderHints, layout, op, constants, roi, noData, destinationNoData);
    }
}
